C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Changing rear diff fluid, what weight and how much do i need?

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Old Dec 25, 2003 | 04:23 PM
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Default Changing rear diff fluid, what weight and how much do i need?

I already have a tube of limited slip additive. Also, do i need any special tools for this job, or is there a drain plug as well as a fill plug on my diff? (dana36 in '89 auto)
Thanks
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Old Dec 26, 2003 | 09:24 AM
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Default Re: Changing rear diff fluid, what weight and how much do i need? (Wheelman)

Unfortunately, there is no drain plug, only a fill plug. You will have to suck the old fluid out.
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Old Dec 26, 2003 | 10:43 AM
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Default Re: Changing rear diff fluid, what weight and how much do i need? (STL94LT1)

You need a small hand vacuum to suck the old out. Drive the car around some to get teh fluid up to temperature before trying to get it out. This will help thin it out and make it easier.
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Old Dec 26, 2003 | 01:08 PM
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Default Re: Changing rear diff fluid, what weight and how much do i need? (scorp508)

:iagree: :lol: tried it cold,,, what a pain... it definately is alot easier when she's hot.... :cheers: :cheers:
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Old Dec 26, 2003 | 09:04 PM
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Default Re: Changing rear diff fluid, what weight and how much do i need? (Wheelman)

MY D44 requires 1.5 qt of GL-5 gear lube and 4 oz. of limited-slip additive.
Per the factory service manual.
Pulling that stuff out with a hand pump is hard work....

Larry
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:seeya
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Old Dec 26, 2003 | 10:20 PM
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Default Re: Changing rear diff fluid, what weight and how much do i need? (Wheelman)

of late, Gordon Killebrew is recommending 2 bottles of additive.
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Old Dec 27, 2003 | 12:38 PM
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Default Re: Changing rear diff fluid, what weight and how much do i need? (Wheelman)

Just did it last month. I used redline 75w90.
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Old Dec 27, 2003 | 03:31 PM
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Default Re: Changing rear diff fluid, what weight and how much do i need? (95coupe)

Use the Mobil 1, Red-Line or Amsoil 75-90W w/one tube of additive. It should take 1.5 quarts or so.

Mike
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Old Dec 27, 2003 | 04:14 PM
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Default Re: Changing rear diff fluid, what weight and how much do i need? (Wheelman)

the corvette clinic sells a kit with drill, tap and template and plug to add a drain for the C4 it's $ 46.00. corvette central also sells it but they want $ 55.00 :cheers:
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Old Dec 28, 2003 | 06:32 PM
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Default Re: Changing rear diff fluid, what weight and how much do i need? (Rick92)

hm... 46.00 for a bit, tap and plug?

I can do that for a lot less at my local hardware store... honestly... and bum a big drill bit...

infact, I am gonna do that here when I replace the rear spring.
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Old Dec 29, 2003 | 01:22 PM
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Default Re: Changing rear diff fluid, what weight and how much do i need? (bogus)

I'm sure you are right about that, I didn't put much thought into it thanks :cheers:
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Old Dec 29, 2003 | 01:24 PM
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Default

There are some who feel adding a drain plug weakens the structural integrity of the aluminum cover making it more prone to cracking under high stress.
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Old Dec 29, 2003 | 03:56 PM
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Default Re: (scorp508)

How often is it recommended to change the rear diff fluid?
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